Then you can start to get an idea of what its orbit is and be able to predict where it's going to be in the future.
Andy Puckett
It was so sparse out there they didn't get close enough to each other to collide and form a planet.
close planet form
I think about how bright they are and whether I can find them.
bright find
idea future start
It is the first step toward understanding what the surface is made out of.
understanding made
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